James tripp



(N0 Model.)

J. TRIPP. SHUTTLE OPERATING MEGEANISM EOE SEWING MACHINES.

No. 398,291. Patented Feb. 19, 1889.

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WITNESS ES @fia/ZWEI JVZEZV* Nrrnn STATES 2'TENT OFFICE.

JAMES TRIPP, OF NFV YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 398,291, dated February19, 1889. Application flied May 3l, 1888. Serial No. 275,642. (Nomodel.)

.To all whom, it may concern:

Be it known that I, J AMES TRIPP, a citizen of the United States, and aresident of New York, in the county and State of New York, have inventedcertain new and useful Improvements in SewingMachine Shuttles andMechanism for Operating' the Same, of which the following is a full,clear, and exact description, reference being had to the acco1npanyingdrawings.

rlhis invention relates to rotary or rotarilyoscillating shuttles forsewing-machines, and particularly to the class of such shuttles that arebodily carried by the shuttle-operating shaft without the assistance ofa race.

The principal object of this construction is to obviate the well-knowndifficulties incident to the employment of a race in connection with arotating shuttle, they being, essentially, that the lint and ilock,particularly of shoddy and woolen goods, get into the race and clog thesame, and the oil that is required to a free and easy ruiming of theshuttle becomes gummed, and besides soiling the stitchingthreadscollects the dirt and lint and causes friction and hard running of theshuttle and wear of the parts.

lleretofore shuttles of this kind have been mounted on the shuttleshaftwith a view to overcoming these difficulties, and the parts that connectthe shuttle to its ope'ratingshaft have consisted of peripheral fingersor pawls grasping the shuttle and actuated to loose it for the passageof ythe thread; also, the shuttle has been driven by lugs enteringrecesses therein and the shuttle caused to move to and from the lugs topermit the thread to pass; and the shuttle has been driven by acrankconnection, parts of whichrhave been notched to permit the threadto pass. In all these forms of shuttles and slnrttle-actuating devicesthe necessary play or loosencss of the shuttle-driving devices resultsin an undesirable irregular motion of the shuttle and causes rattling orshaking, thus affecting' the speed of the shuttle and causing thethread. to catch and be tangled and the parts to be clogged. To overcomethese objections it is essential to support the shuttle so that it shallhave a steady and regular revolution and not be subjected to anyperipheral or lateral pressure tending to deflect it from its plane ofrevolu tion, as also to provide that the needle-thread shall have anunobstructed and regular passage around the shuttle.

My invention consists, therefore7 of camactuated plungers mounted uponthe shuttleshaft and parallel therewith and reciprocating alternatelyinto and out of corresponding holes in the shuttle, whereby the shuttlerevolves with the shuttle-shaft and the needlethread is permitted topass freely around the shuttle.

In the drawings, Figure 1 is a front or elevation view of the shuttle,shuttle face-plate, and surrounding parts. A Fig. 2 is a central sectionof the parts of Fig. 1 on the plane e e of that iigure. Fig. 3 is acentral horizontal section on plane fw w of the outer plungersleeve,showing the inner plunger-sleeve and shuttle-shaft in full. Fig. 4 is aface or end view of the same. Figs. 5 and 6 are detail views of theplunger-sleeves. Fig. 7 is a central longitudinal section on plane 0a ofthe cam-bushing in which the plungers work. Fig. S is a face view of theshuttle. Figs. 9 and 10 are reverse face views of the bobbin-case, andFig. 11 is a face view of the bobbin.

Referring to these views in detail, A represents the work-plate of asewing-machine.

B is a journal-lug depending from the underneath side thereof, and whichserves to support the shuttle en d of the shuttle-actuating shaft O.

D is a cam-sleeve, which is iiXed in the lug B and has the internalcam-groove, E.. Upon the shuttle-shaft is mounted the inn er plungersleeve7 F, and upon this sleeve F is mounted the outer plunger-sleeve,G, which fits closely in the cam sleeve or bushing D. These sleeves arekeyed to the shuttle-shaft by key .l-l, which passes up through slots inthe sleeves and permits them to have independent longitudinal motion onthe shuttleshaft. They are also provided with cam-rollers l' and J,which extend radially into the cam-groove E, the roller I of the innersleeve being mounted on a pivot projecting from such sleeve up through aslot, J in the outer sleeve. By this arrangement of these parts it willbe seen that as the IOO shuttle-shaft revolves these sleeves will beindependently reciprocated longitudinally and parallel with theshuttle-shaft, according to the direction of the cam-groove.

K is the shuttle, which is pierced with longitudinal holes L L L toreceive the plungerpins M M M on the head of the plunger F, and withholes N N N, which are to receive the plunger-pins O O O on the head ofthe plunger G.

P is a bracket-arm extending forward from the lug B to just below theshuttle, and its office is to support the face-plate Q of the shuttle,upon which arm this plate is adjust` able to and from the shuttle, theset-screws R serving to hold it in any desired position. This face-platesimply bears against the shuttle, constituting its plane of revolution,and holds it against the slight thrust forward due to the friet-ion ofthe plunger-pins entering the holes therein. Upon the face of theplunger-heads, and preferably fitted around one or more of the pinsthereof, are cushions S and T. l have shown these cushions as being ofleather, felt, or a similar material; but they may be springs andconstructed of metal. Their office is to ll the slight space between theplunger-heads and the back of the shut tie'and to shield the shuttlefrom any possible shock, as well. as to hold it delicately pressedagainst its faceplate and prevent any vibration, while still permittingit to run with the greatest freedom and the least friction.

The shuttle is provided with a central hollow post, U, which receives acentral pin, M, of the inner plunger, thus affording a central bearingfor the shuttle and further insuring its steadiness of motion. Thiscentral pin is not, however, essential, though it affords a convenientmeans for centering the shuttle and preventing eccentric motion thereof.

The bobbin-case V is provided. with a hollow hub, XV, adapted to slideover the post U of the shuttle. The bobbin X is of the usual form andrides upon the hub NV of the bobbin-case. The bobbiircase is providedwith a ten sion-spring,Y, for the bobbin-thread, which spring may be ofany approved form, and the b0bbincase may be held in the shuttle by anyof the well-known means.

In Fig. S I have indicated the positions relatively to the shuttle ofthe camsurfaces by the lines a b and c d, the shuttle being about totake the loop then forming by the upward movement of the needle. In thisposition of the shuttle the outer plunger is carrying the shuttle andvthe inner plunger is advancing into it. After the shuttle has taken theloop and turned to a position where the loop would begin to strike theforward pin of the outer plunger-that is, a position where such pinwould be nearly under the needlethe cam roller of this plunger strikesthe backward incline of the cam-groove, and in passing between thepositions a and c withdraws the pins of this plunger from the shuttle.The cani-roller of the inner plunger has, just previous to the beginningof the backward movement of the outer plunger, passed over the space bd, which represents the forward incline of the cam-groove, and its pinshave entered the shuttle and it is in position to carry the shuttlebefore the pins of the outer plunger have begun to withdraw to permitthe loop to pass between them and the shuttle. lVhen the shuttle hasrevolved to the position that brings the outer plunger-cam to theposition l) CZ, the pins of this plunger again ent-er the shuttle andare in position to carry it by the time the shuttle has made somewhatmore than one-half of its revolution and when the loop will be about tostrike the center pin of the inner plunger. At this time the cam-rollerof the inner plunger' will strike the cam-incline a c and its pins willbe withdrawn to allow the loop to be taken off the shuttle by thetake-up mechanism.

lt is to be noticed that at two points in the revolution of theshuttle-namely, the points a b-both plungers are projecting forward intoand pressing against the shuttle, and that before either plunger beginsto leave the shuttle the other plunger has moved to its advancedposition with its pins inserted in the shut-tlc ready to support andcarry it. This insures the shuttle being at all times held lightlyagainst its face-plate by one of the plungers and concentric with theshuttleshaft--that is, it is held so that it cannot move from its planeof revolution nor away from the axis of such shaft. By these means theshuttle is bodily carried with great steadiness and regularity, and theuse of and obj ections to a shuttle-race are obviated. Furthermore, ashuttle thus supported and actuated Can be run at a high speed, and thewear of the same is so slight as to be negligible.

It is obvious that various of the parts l have here shown aresusceptible of alteration and change, and that these improvements areapplicable to either oscillating or rotating shuttles. l do not,therefore, limit myself to the exact form and arrangement here shown,which are designed and will suliice to explain the nature of theinvention to those skilled in the art.

lVhat is claimed as new is l. The combination, in a sewing-machine, of ashuttle-shaft, two plungers mounted upon the same and each provided withtwo or more pins to engage and carry the shuttle, with a shuttleprovided with holes to receive the plunger-pins, a face-plate to holdthe shuttle against the thrust of its carryingpins, and a cam foralternately reciprocatingthe plungers to and from engagement withshuttle to permit the loop to pass, the plungers and the cam beingarranged so that one of the pluna gers will at all times be advancedwith its pins engaging and carrying the shuttle.

2. In a sewingunachine, the combination, with the shuttle-sh aftcarrying plun gers which IOO IIO

loop pass its pins and again inserted therein,

and a, cushion arranged between the shuttle and the plungers.

JAMES TRrPP.

Vtuesses:

HENRY F. NEWBURY, RoBT. F. GAYLoRD.

